L1-4 Respiration Flashcards Preview

BMS242 CVS Phys > L1-4 Respiration > Flashcards

Flashcards in L1-4 Respiration Deck (195)
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1

Describe the relationship between pressure gradient resistance and flow during laminar flow

Flow rate proportional to the pressure gradient and inversely proportional to the resistance

2

Equation for laminar flow

V = delta P / R

3

Equation for turbulent flow

V=k ROOT(delta P)

4

Three types of flow in the lungs

Laminar turbulent and transitional

5

Describe laminar flow

Steady flow down a tube with uniform direction and speed

6

During laminar flow, where is flow rate the highest

The centre

7

What are present in turbulent flow

Vorticies and eddie currents

8

A change in pressure gradient will have a greater effect on flow rate in laminar or turbulent

Laminar - turbulent flow requires a larger change in pressure gradient for the same effect to be seen on flow rate

9

Transitional flow arises as a result of

High number of biurification

10

Transitional flow is charaterised as

The switching between laminar and turbulent

11

What number is used to determine flow type

Reynolds

12

Give the equation for Reynolds number

Re = (2rvp)/n

13

In the Reynolds equations what does the following character represent: Re

Reynolds number

14

In the Reynolds equations what does the following character represent: r

Radius

15

In the Reynolds equations what does the following character represent: v

Velocity

16

In the Reynolds equations what does the following character represent: p

Density of the gas

17

In the Reynolds equations what does the following character represent: n

Viscosity

18

What type of flow if Re less than 1000

Laminar

19

What type of flow if Re greater than 1500

Turbulent

20

What type of flow if Re between 1000 & 1500

Transitional

21

In the lung a Re of around ___ is required for laminar flow

10

22

Why may a Re less than 1000 not give laminar flow in the lungs

Not uniform shapped tubes

23

Why does velocity initially increase in the lungs

Tube gets smaller - must increase velocity to maintain flow rate

24

At the top: High/low CSA

Low

25

At the bottom: High/low CSA

High

26

At the top: high/low velocity

High

27

At the bottom: High/low velocity

Low

28

At the top: laminar/turbulent

Turbulent

29

At the bottom: Laminar/turbulent

Laminar

30

What does Poiseulles law determine

Resistance